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* The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-11  5:27 Mukund JB.
  2005-08-11  5:56 ` Marc Singer
  2005-08-11 15:33 ` Lennart Sorensen
  0 siblings, 2 replies; 24+ messages in thread
From: Mukund JB. @ 2005-08-11  5:27 UTC (permalink / raw)
  To: hirofumi; +Cc: linux-kernel-Mailing-list

Dear all,

I am Linux driver programmer. 

I have a FAT12 issue on my SD cards. I have got these addresses from the
fs-lists as the maintainer support mail IDs for FAT-FS.

I am using the 2.6.10 kernel, X86 like systems.

I am NOT able to mount the Camera formatted FAT12 filesystem on my linux
BOX. SD card is of size 16MB. At the same time I am able to mount the SD
cards formatted in windows & linux.

I have identified fat_fill_super() in fs/fat/inode.c file as the
function that reads the super block of as MS-DOS FS.

To debug, I have rebuilt my kernel 2.6.10 inserting some debug messages
in the FS sub-system to know what data is coming into "struct
fat_boot_sector *b" structure in fs/fat/inode.c file after sb_bread()
call.

I believe that this data in the "struct fat_boot_sector *b" should be
FAT12 information.

On the camera formatted SD that is NOT mounting I have found this
structure to be all '0' till total_sectors variable (relevant till here
on - FAT12).

Will you please verify if there & tell me if the problem is in the FAT
sub-system.

Regards,
Mukund Jampala

 

 

 



^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-12 14:22 Mukund JB.
  2005-08-12 14:48 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB. @ 2005-08-12 14:22 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

Dear Lennart,

I have an update on this. Please see the message indented inline.

>A few things I would try:
>
>Stick the SD card in a generic cheap USB media reader, and see what the
>kernel thinks of the cards then.  Do both work?

I do NOT have one. I am getting it today.  I will work on it this
weekend?

>You could also use that do dd the first few blocks from the card to see
>what the partition table and fat tables look like, in case your SD
>driver is somehow messing that part up.  By having a copy you can
>compare more easily.

I dumped the 0th sector of SD when formatted on 
	1) CAM &
	2) Windows
The partition table exists on both.
But, the Master Boot Code is NOT present on the CAM formatted SD but is
available on windows formatted SD card.

Can you comment on the Master Boot Code? What is it required on Linux
HOW does windows managed without it? I mean how is Windows able to mount
the SD?

My driver does NOT support partitions? I mean I have implemented it as
alloc_disk(1) & relative first_minor chage obviously.

Is it why I am NOT able to mount the CAM formatted device?
Is this a problem?

Thanks & Regards,
Mukund Jampala

^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-12 14:31 Mukund JB.
  0 siblings, 0 replies; 24+ messages in thread
From: Mukund JB. @ 2005-08-12 14:31 UTC (permalink / raw)
  To: Marc Singer; +Cc: hirofumi, linux-kernel-Mailing-list

[-- Attachment #1: Type: text/plain, Size: 2946 bytes --]


Dear Marc,

I have doubt about the driver?
I do NOT support the partitions in my driver. I mean I have implemented
it as alloc_disk(1) i.e. 0 partitions. 
Is this what is creating the HAVOC to mount my SD card? 
Do I need to support the partitions in my driver to support mounting SD
cards formatted in DIGITAL CAMERAS?(clarity needed)

I have an update on the CAM formatted SD. 

SECTOR-0 Description:
Bytes		0   		446
512		
Details	|-  MB code -| - partition + signature	 | 
					Table

I dumped the 1st sector of SD when formatted on 
	1) CAM &
	2) Windows
Yes, the partition table exists on both.
The only protruding difference I find is the Master Boot Code. Can you
comment on the Master Boot Code? 

I tried copying the windows SD first 446 bytes to CAM SD first 446
bytes.
I am able to mount but I am loosing the data.

I have attached the files. Please have a look at them

	Cluster-0.txt - First 16 Blocks of the device
	Phy-Cam-57-sector.txt - 57th sector of the device (claimed FAT
in
Partition table)

Thanks & Regards,
Mukund Jampala

>-----Original Message-----
>From: Marc Singer [mailto:elf@buici.com]
>Sent: Thursday, August 11, 2005 11:26 AM
>To: Mukund JB.
>Cc: hirofumi@mail.parknet.co.jp; linux-kernel-Mailing-list
>Subject: Re: The Linux FAT issue on SD Cards.. maintainer support
please
>
>On Thu, Aug 11, 2005 at 10:57:14AM +0530, Mukund JB. wrote:
>> Dear all,
>>
>> I am Linux driver programmer.
>>
>> I have a FAT12 issue on my SD cards. I have got these addresses from
the
>> fs-lists as the maintainer support mail IDs for FAT-FS.
>>
>> I am using the 2.6.10 kernel, X86 like systems.
>>
>> I am NOT able to mount the Camera formatted FAT12 filesystem on my
linux
>> BOX. SD card is of size 16MB. At the same time I am able to mount the
SD
>> cards formatted in windows & linux.
>>
>> I have identified fat_fill_super() in fs/fat/inode.c file as the
>> function that reads the super block of as MS-DOS FS.
>>
>> To debug, I have rebuilt my kernel 2.6.10 inserting some debug
messages
>> in the FS sub-system to know what data is coming into "struct
>> fat_boot_sector *b" structure in fs/fat/inode.c file after sb_bread()
>> call.
>>
>> I believe that this data in the "struct fat_boot_sector *b" should be
>> FAT12 information.
>>
>> On the camera formatted SD that is NOT mounting I have found this
>> structure to be all '0' till total_sectors variable (relevant till
here
>> on - FAT12).
>>
>> Will you please verify if there & tell me if the problem is in the
FAT
>> sub-system.
>
>Alternatively, you can dump the first block of the device/partition.
>From that, you can determine if there is a partition table.  In any
>case, you can read the first block of the partition (or whole device)
>and get the filesystem parameter block.
>
>It should be easy from there to determine if the data can be
>recognized as FAT.


[-- Attachment #2: cluster-0.txt --]
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^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-12 15:46 Mukund JB.
  2005-08-12 16:00 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB. @ 2005-08-12 15:46 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

[-- Attachment #1: Type: text/plain, Size: 3346 bytes --]


Dear Lennart,

Thanks for the immediate reply.
Please see inline comments.

>If you don't at least read the partition table to find where the first
>partition starts, then you won't know where to start looking for a FAT
>filesystem.

When I said mount, I guess FAT will read sector 0 to get the partition
info. And is it due to lack of partition support in the driver that will
affect the FAT layer reading the device.
Please update?

>> Is it why I am NOT able to mount the CAM formatted device?
>> Is this a problem?
>
>Well in the past I have seen cards that had a partition table, with one
>partition in it (usually either primary partition 1 or 4) and had that
>partition formated with FAT12, 16 or 32 (depending on size).  

Yes, right, my card size if 16 MB. FS type is FAT12.

> Some had no partitions, and just had the whole device formated with
FAT   > like a floppy.  Windows seems to deal with both, as does linux
(as long as  > you ask it to mount the right device such as /dev/sda1
sda4 or sda         > depending on which partition (if any) the card
uses.

The SD card has partitions on it (both: cam, windows).
So, my device node accessing is direct. 
You can see below the SD card has a single primary partition.

So, I say "mount -tvfat /dev/tfa0 /mnt" which works for windows
formatted SD.
The same does NOT work with CAM formatted SD.

Sfdisk -l /dev/tfa0 ( CAM & win)
Disk /dev/tfa0: 448 cylinders, 2 heads, 32 sectors/track
Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/tfa0p1   *      0+    449     450-     14371+   1  FAT12
/dev/tfa0p2          0       -       0          0    0  Empty
/dev/tfa0p3          0       -       0          0    0  Empty
/dev/tfa0p4          0       -       0          0    0  Empty
Warning: partition 1 extends past end of disk

I don't understand, what is /dev/tfa0p1? I have no such device.

>If you ignore partitions entirely, many cards will not work for you
>since they do have partitions on them.  Some will work if they use the
>entire device without partitions like a floppy would.

Will you please elaborate this?
What kind of partition support is required in the driver to support the
Camera Fat12 formatted SD Card?

I dumped the 1st sector of SD when formatted on CAM.
I have attached the files. Please have a look at them

	Cluster-0.txt - First 16 Blocks of the device
	Phy-Cam-57-sector.txt - 57th sector of the device (claimed FAT
sector
in Partition table)

Regards,
Mukund Jampala



>And the minfo of the partition:
>device information:
>===================
>filename="/dev/sde1"
>sectors per track: 32
>heads: 2
>cylinders: 450
>
>mformat command line: mformat -t 450 -h 2 -s 32 -H 57 c:
>
>bootsector information
>======================
>banner:"PwrShot "
>sector size: 512 bytes
>cluster size: 32 sectors
>reserved (boot) sectors: 1
>fats: 2
>max available root directory slots: 512
>small size: 28743 sectors
>media descriptor byte: 0xf8
>sectors per fat: 3
>sectors per track: 32
>heads: 2
>hidden sectors: 57
>big size: 0 sectors
>physical drive id: 0x80
>reserved=0x0
>dos4=0x29
>serial number: 6F68CF4E
>disk label="CANON_DC   "
>disk type="FAT12   "
>
>Len Sorensen

[-- Attachment #2: Phy-Cam-57-sector.txt --]
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[-- Attachment #3: cluster-0.txt --]
[-- Type: text/plain, Size: 16384 bytes --]

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^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-16 13:24 Mukund JB.
  2005-08-16 16:08 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB. @ 2005-08-16 13:24 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

Dear Lenneart,

Good Morning. Sorry for the delay.
It is Independence Day celebration Week in INDIA. And it's time for my
independence from this problem.
Please see my advances in-lined below.

Work time
-----------
>> And is it due to lack of partition support in the driver that will
>> affect the FAT layer reading the device. Please update?
>
>No, the kernel read the partition table if it is there, and presents
>each partition as a device.
Yes, I agree. My sentence formation was wrong.

My question here is:

If I have NO multiple partition support implemented in the driver, will
it effect mounting the first partition on the device?

i.e. If I said alloc_disk(1) (single partition), and if I am trying to
mount the very first partition, will I be able to do it?

Existing gendisk code:
---------------
	alloc_disk(1);
	first_minor = socket_no; // Device socket no varies from 0 - 3.
					 // so, each device- we have
just one node; 					 // NO partitions on
each device.

Device Interface: mknod /dev/tfa0 b 252 0

Will I have to modify the above code? 
Will you tell me what else do I need to handle multiple partition in my
driver apart from alloc_disk(n) & first_minor modifications as per n(n/o
partitions)?

>> So, I say "mount -tvfat /dev/tfa0 /mnt" which works for windows
>> formatted SD.
>> The same does NOT work with CAM formatted SD.
>
>Well if you ignore the partition table and just use a hardcoded offset
>to the start of the partition, well then it likely won't work if the
>partitioning layout is different for the two cards.

The partition layout mentioned in the partition table is same for the
Windows formatted SD & CAM formatted SD. I assume partition layout
starts at 0x1BE.

>> Sfdisk -l /dev/tfa0 ( CAM & win)
>> Disk /dev/tfa0: 448 cylinders, 2 heads, 32 sectors/track
>> Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from
0
>>
>>    Device Boot Start     End   #cyls    #blocks   Id  System
>> /dev/tfa0p1   *      0+    449     450-     14371+   1  FAT12
>> /dev/tfa0p2          0       -       0          0    0  Empty
>> /dev/tfa0p3          0       -       0          0    0  Empty
>> /dev/tfa0p4          0       -       0          0    0  Empty
>> Warning: partition 1 extends past end of disk
>>
Can you quote your comments on the warning given by sfdisk command
above?

>> I dumped the 1st sector of SD when formatted on CAM.
>> I have attached the files. Please have a look at them
>>
>> 	Cluster-0.txt - First 16 Blocks of the device
>> 	Phy-Cam-57-sector.txt - 57th sector of the device (claimed FAT
>> sector
>> in Partition table)
>
>Well one of the two files you sent appears to contain a FAT12
filesystem
>directly on the device and has no partitions.  The other appears to
>contain a partition table with one partition, and I suspect that
>partition contains a FAT12 filesystem.

These files belong to the same device. They are just different sectors
of the device file. 
	
	Cluster-0.txt - First 16 Blocks of the device
	Phy-Cam-57-sector.txt - 57th sector of the device (claimed FAT
	
Sector)

>So for the device above with one partition, you would have to check
>the partition table entry to find the start sector number of the
>partition and then offset requests by that amount.

You mean the application like mount should check the partition table
entry to find the start sector number of the partition and then mount
the particular partition.

>For example:
>fdisk -l -u /dev/sde:
>debdev1:~# fdisk -l -u /dev/sde
>
>Disk /dev/sde: 14 MB, 14745600 bytes
>2 heads, 32 sectors/track, 450 cylinders, total 28800 sectors
>Units = sectors of 1 * 512 = 512 bytes
>
>   Device Boot      Start         End      Blocks   Id  System
>/dev/sde1              57       28799       14371+   1  FAT12
>
>So if you skip 57 sectors you would see the FAT12 filesystem.
>

Can you comment on the fdisk output which says the total sectors are
28672 while the total n/o sector passed to fdisk through the HDIO_GETGEO
ioctl is 28800.

I have a single ioctl implemented in the driver i.e HDIO_GETGEO ioctl.

fdisk -l -u /dev/tfa0:
debdev1:~# fdisk -l -u /dev/tfa0

Disk /dev/tfa0: 14 MB, 14680064 bytes
2 heads, 32 sectors/track, 450 cylinders, total 28672 sectors
Units = sectors of 1 * 512 = 512 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/ tfa0p1		57       28799       14371+   1  FAT12


>On your card without a partition table, the FAT12 starts at sector 0,
on
>the other it is offset by the number of sectors to the start of the
>first partition.

This is a miscommunication. I have sent u the files of the same device
at different offsets and NOT different devices. One of them is cluster 0
and the other one sector 57 of the device which is the start of
partition table as seen in the above fdisk output.

Regards,
Mukund Jampala



^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-16 13:34 Mukund JB.
  2005-08-16 13:59 ` Olivier Galibert
  2005-08-16 16:09 ` Lennart Sorensen
  0 siblings, 2 replies; 24+ messages in thread
From: Mukund JB. @ 2005-08-16 13:34 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

Dear Lennart,

I have bought a "entermultimedia" USB 2.0 21-in-1 card.
There are no Linux driver support in the CD  provided.
Can u suggest me what is best bug (USB card reader) with Linux driver
support in the Market.

Regards,
Mukund Jampala

>-----Original Message-----
>From: Lennart Sorensen [mailto:lsorense@csclub.uwaterloo.ca]
>Sent: Thursday, August 11, 2005 9:04 PM
>To: Mukund JB.
>Cc: hirofumi@mail.parknet.co.jp; linux-kernel-Mailing-list
>Subject: Re: The Linux FAT issue on SD Cards.. maintainer support
please
>
>On Thu, Aug 11, 2005 at 10:57:14AM +0530, Mukund JB. wrote:
>> I am Linux driver programmer.
>>
>> I have a FAT12 issue on my SD cards. I have got these addresses from
the
>> fs-lists as the maintainer support mail IDs for FAT-FS.
>>
>> I am using the 2.6.10 kernel, X86 like systems.
>>
>> I am NOT able to mount the Camera formatted FAT12 filesystem on my
linux
>> BOX. SD card is of size 16MB. At the same time I am able to mount the
SD
>> cards formatted in windows & linux.
>>
>> I have identified fat_fill_super() in fs/fat/inode.c file as the
>> function that reads the super block of as MS-DOS FS.
>>
>> To debug, I have rebuilt my kernel 2.6.10 inserting some debug
messages
>> in the FS sub-system to know what data is coming into "struct
>> fat_boot_sector *b" structure in fs/fat/inode.c file after sb_bread()
>> call.
>>
>> I believe that this data in the "struct fat_boot_sector *b" should be
>> FAT12 information.
>>
>> On the camera formatted SD that is NOT mounting I have found this
>> structure to be all '0' till total_sectors variable (relevant till
here
>> on - FAT12).
>>
>> Will you please verify if there & tell me if the problem is in the
FAT
>> sub-system.
>
>A few things I would try:
>
>Stick the SD card in a generic cheap USB media reader, and see what the
>kernel thinks of the cards then.  Do both work?
>
>If the answer is still no, then it really seems the card is formated
>incorrectly, or linux has a bug in the fat driver.
>
>If both work fine that way, then there is a problem in the driver for
>the sd reader you are using that needs to be resolved.
>
>Using a known to work for people in general driver (usb-storage) with
>a standard usb card reader sure does seem like a good start until you
>know if the card is formated properly or not.
>
>You could also use that do dd the first few blocks from the card to see
>what the partition table and fat tables look like, in case your SD
>driver is somehow messing that part up.  By having a copy you can
>compare more easily.
>
>Len Sorensen


^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-17 17:02 Mukund JB`.
  2005-08-17 18:50 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB`. @ 2005-08-17 17:02 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list


Dear Lennart,

A have a new fining here.

fdisk -l -u /dev/tfa0:
debdev1:~# fdisk -l -u /dev/tfa0

Disk /dev/tfa0: 14 MB, 14680064 bytes
2 heads, 32 sectors/track, 448 cylinders, total 28672 sectors Units =
sectors of 1 * 512 = 512 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/ tfa0p1		57       28799       14371+   1  FAT12

On a keen look on the above fdisk output on my 16MB SD card, you can
find the cylinder information as 448 where as my driver ioctl returns
450.

I have found from the partition table that Total n/o sector for the
primary partition is 28743 (total sectors).
But my ioctl returns total cylinders as 450 i.e. 28800 sectors.
As 28743 is NOT any multiple of 64(2*32)i.e sectors*heads, the fdisk
tried manipulates it to get multiples of 64.
So, finally the best multiple 448 cylinders (i.e. 28672 sector)
So, finally that NOT a BUG in the driver instead is a generalization
made by fdisk command.

Please find the inline comments.

>Well you can either support partitions fully by making your driver work
>like the ide and scsi and such drivers do things, or you can just make
>it simpler and only support devices without a partition table and those
>with a single partition entry in the partition table.  That would
>support probably 99.99% of cards you would encounter.  You just have to
>check if a partition table exists, if it doesn't, just present the
whole
>device as the disk, while if a partition table exists, scan it for a
>partition that is not a blank entry, then find the start of that
>partition and present the device to the user starting at that sector.

This is a policy & NO policy is the driver should be implemented.
I think we need NOT handle all this in the driver. The upper layer of
the mount application looks into verifying this.

>> The partition layout mentioned in the partition table is same for the
>> Windows formatted SD & CAM formatted SD. I assume partition layout
>> starts at 0x1BE.
>
>If there is a partition table then it starts there.

There is a partition table in the CAM formatted device & it looks like
there is also a partition table in the win formatted device.
The details of there at offset 0x1BE are below.

CAM formatted SD Details
------------- 0x1BE offset detailed messages (decimal no
)------------------ Reading data from sector '0' at offset
0x1BE(Partition table start addr)

bootable 		= 0x80	(0x1BE)
beg-chs.heads 	= 0x1
beg-chs.sect 	= 0x1A
beg-chs.cylin 	= 0x0
sys-type 		= 0x1
end-chs.heads 	= 0x1
end-chs.sect 	= 0x60
end-chs.cylin 	= 0xC1
start sect  	= 0x39
n/o sec in part 	= 0x7047


Win formatted SD Details
------------- 0x1BE offset detailed messages (decimal no
)------------------ Reading data from sector '0' at offset
0x1BE(Partition table start addr)

bootable 		= 0x6F	(0x1BE)
beg-chs.heads 	= 0x74
beg-chs.sect 	= 0x68
beg-chs.cylin 	= 0x65
sys-type 		= 0x72
end-chs.heads 	= 0x20
end-chs.sect 	= 0x6D
end-chs.cylin 	= 0x65
start sect  	= 0x2E61964
n/o sec in part 	= 0x440A0DFF


>> >> Sfdisk -l /dev/tfa0 ( CAM & win)
>> >> Disk /dev/tfa0: 448 cylinders, 2 heads, 32 sectors/track
>> >> Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting
from
>> 0
>> >>
>> >>    Device Boot Start     End   #cyls    #blocks   Id  System
>> >> /dev/tfa0p1   *      0+    449     450-     14371+   1  FAT12
>> >> /dev/tfa0p2          0       -       0          0    0  Empty
>> >> /dev/tfa0p3          0       -       0          0    0  Empty
>> >> /dev/tfa0p4          0       -       0          0    0  Empty
>> >> Warning: partition 1 extends past end of disk
>> >>
>> Can you quote your comments on the warning given by sfdisk command
>> above?
>
>The warning means the driver is broken and says the wrong number of
>cylinders for the device.

NO, I think driver is NOT broken instead the partition tables speaks SO.
sfdisk returns 448 cylinders for my 16MB SD card, where as my driver
ioctl returns 450.

I have found from the partition table that Total n/o sector for the
primary partition is 28743 (total sectors) whereas my ioctl returns
total cylinders as 450 i.e. 28800 sectors. 

As 28743 is NOT any multiple of 64(2*32)i.e sectors*heads, the sfdisk
manipulates it to get multiples of 64. The best multiple is 448
cylinders (i.e. 28672 sector). This is where we are missing 128 sectors.

So, finally that NOT a BUG in the driver instead is a generalization
made by sfdisk command.

>Perhaps one of the more modern ways of getting disk size would return
>the full number of sectors instead.  For example the ioctl BLKSSZGET
and
>BLKGETSIZE and BLKGETSIZE64.
I added BLKGETSIZE ioctl. When I tried to note the ioctl called at mount
time I find it is all the time HDIO_GETGEO.

At this angle it clear that sfdisk output is Not the result of BUG in
the driver instead it is a result of partition table TOTAL SECTORS
entry. 

I have a doubt where Linux is treating this a separate class of device.
I heard some thing about the FS found on the Floppies. 
I guess FS on win & linux SD is such kind of FS & so I am able to mount
it.

How do I verify this? I am clean about the FS on Floppies. I will try to
find it tomorrow on the NET.

As CAM SD has altogether HD like info. And that is why we are NOT able
to mount it.

Can you comment on this?

Regards,
Mukund Jampala


^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-18 12:51 Mukund JB`.
  2005-08-18 17:26 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB`. @ 2005-08-18 12:51 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

[-- Attachment #1: Type: text/plain, Size: 2705 bytes --]

Dear all,

I have few updates in this issue.
I have attached the Images as well as the mount-log to this mail.
Please see the comments inline.

>If the partition starts at sector 57 and is 28743 sectors long, then
>that matches 28800 sectors total.  No problem there.
>
>If on the other hand fdisk reports 28672 sectors total then there is a
>problem somewhere.

I think, fdisk it trying to portray that n/o cylinders 448. So, it also
takes care of displaying the relevant n/o sector & NO more or NO less.

>Well then you have to implement full partition support and present a
>seperate device for each partition in /dev so that mount can access
each
>partition.

I have implemented the partition support in the driver but some HOW I am
NOT able to get the driver working with all the sockets. It is just
working with the socket 0 and NO other socket. 
I mean I am able to mount windows & linux formatted SD card with new
driver present from socket 0.

>> There is a partition table in the CAM formatted device & it looks
like
>> there is also a partition table in the win formatted device.
>> The details of there at offset 0x1BE are below.

I have an update on this.

I found some common things between the windows formatted SD & Linux
formatted SD.
I found that both of then do NOT have the partition table.
I found that both of them have FAT12 FS in the sector 0 starting at
offset 0.
Why? I am NOT able to guess.

For Windows formatted SD there is NO partition table at all.
I went on more R&D and tried to get to format the USB-Thumb drive.
Even that did NOT have a partition table. 
It looks like windows treats all removable media device as devices with
NO partitions.

Even on Linux formatted SD there is NO partition table present.

Please have a look at the images I am attaching to this mail.
I have attached CAM-MS, WIN-Ms & Linux-MS first 512 byte length Images.
These are the Images of first 512 bytes of sector 0.
You can find the FS there on Lin & Win Images.

I have verified this by keeping some DEBUG messages in the FAT layer &
seeing what data is being passed to this fat_boot_sector structure when
mount call is issued.
I am also attaching those LOG messages. please Have a LOOK at them too &
you will have a fair understanding.

>That one looks more like random numbers.  Maybe the partition entry
that
>it really uses is not number 1, but number 2 3 or 4, or no partition
>table at all.
I have verified it with fdisk -l -u /dev/tfa0 
It has shown that it is the partition 0 & nothing else.

>Could you do dd if=/dev/sda bs=512 count=1 | xxd
Please see the Images-All-MS-512.tar.gz.

Regards,
Mukund Jampala


[-- Attachment #2: Images-512-xxd-type.tar.gz --]
[-- Type: application/x-gzip, Size: 1705 bytes --]

[-- Attachment #3: mount-logs-all.tar.gz --]
[-- Type: application/x-gzip, Size: 5521 bytes --]

^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-18 12:56 Mukund JB`.
  0 siblings, 0 replies; 24+ messages in thread
From: Mukund JB`. @ 2005-08-18 12:56 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

Dear Lennart,

The USB device I have bought is yet to be tested.
I will do it tomorrow. I was busy in figuring out more on this END. Let
me try it to night.
If not I will try it in the tomorrow day time schedule.

Regards,
Mukund Jampala

>> I have bought a "entermultimedia" USB 2.0 21-in-1 card.
>> There are no Linux driver support in the CD  provided.
>> Can u suggest me what is best bug (USB card reader) with Linux driver
>> support in the Market.
>
>Load usb drivers and usb-storage driver and scsi disk module (sd_mod).
>Then it should show up as a scsi disk.  No modern OS requires drivers
>added for usb drives.  They are just included.
>
>Len Sorensen

^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-19 11:39 Mukund JB`.
  2005-08-19 12:59 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB`. @ 2005-08-19 11:39 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list


Dear Lennart,

>> I found that both of then do NOT have the partition table.
>
>If you don't use fdisk to create a partition on the card, then you
won't
>have one.  

I am having the partition table on the cam formatted CARD 
i.e. the partition 0.

> If you mkdosfs on /dev/tfa0 then you loose the partition
>table and get a filesystem on just the whole disk.  If you do it with
>/dev/tfa0p1 then you do it on the first partition which would then have
>the FAT filesystem starting at the offset of the first partition (as it
>should).

Ok, I understood it. It looks like we have to verify the partition
support we have implemented in the driver.

>That is right.  Although I believe if windows sees one with a partition
>table it will just use the first valid partition table entry it finds
>and ignore the rest.

To handle it in a similarly in Linux we need to support this driver with
partitions. There looks a loop hole in the driver. 
I will verify and fix it today.

>> Please see the Images-All-MS-512.tar.gz.
>
>Well to mount anything without a partition table, you would mount the
>whole device (/dev/tfa0) and to mount one with a partition table on it,
>you would mount /dev/tfa0p1 or tfa0p4 or whichever partition it is.
>
>Zip drives used to be the same way.  Some were formated with 1
partition
>(usually 1 or 4) and some had no partition table at all and used the
>whole disk for the filesystem.  I always had a /zip and /zip4 mount
>point I used depending on the particular disk I was looking at.
Just out of inquisitive ness.

What r u the minor numbers of those zip devices.
ll /dev/zip 
ll /dev/zip4

Thanks for ur support.
I will check with partition support in the driver & update it.
Let me fix it there and come back.

Regards,
Mukund Jampala


^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-24  8:33 Mukund JB.
  2005-08-24 13:13 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB. @ 2005-08-24  8:33 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list

Dear Lenneart,

One good news
I have implemented the partition support in the driver.
I am able to mount the partition of the individual device.
I partition them using the fdisk and mounted them.
The architecture this some thing like this
The whole device is represented by tfa0
And rest of the partitions by tfa0p1, tfa0p2 and so on...
If there is a device in second socket, the whole device is represented
by tfa1 and rest of the partitions by tfa1p1, tfa1p2 and so on... I am
following the above conventions. Is the is what in general all Linux
devices follow. 

I have four sockets on which I have to support individual device with
partitions on them. Is there a better conventional way to represent all
the four devices? My driver also supports 4 such controllers. To support
first socket device on the second controller I am using tfb0, tfb0p1,
tfb0p2...

I have left with handling lot of generalization in the code.

Regards,
Mukund Jampala


>-----Original Message-----
>From: Lennart Sorensen [mailto:lsorense@csclub.uwaterloo.ca]
>Sent: Thursday, August 18, 2005 10:57 PM
>To: Mukund JB`.
>Cc: hirofumi@mail.parknet.co.jp; linux-kernel-Mailing-list
>Subject: Re: The Linux FAT issue on SD Cards.. maintainer support
please
>
>On Thu, Aug 18, 2005 at 06:21:39PM +0530, Mukund JB`. wrote:
>> Dear all,
>>
>> I have few updates in this issue.
>> I have attached the Images as well as the mount-log to this mail.
>> Please see the comments inline.
>>
>> I think, fdisk it trying to portray that n/o cylinders 448. So, it
also
>> takes care of displaying the relevant n/o sector & NO more or NO
less.
>>
>> I have implemented the partition support in the driver but some HOW I
am
>> NOT able to get the driver working with all the sockets. It is just
>> working with the socket 0 and NO other socket.
>> I mean I am able to mount windows & linux formatted SD card with new
>> driver present from socket 0.
>>
>> I have an update on this.
>>
>> I found some common things between the windows formatted SD & Linux
>> formatted SD.
>> I found that both of then do NOT have the partition table.
>> I found that both of them have FAT12 FS in the sector 0 starting at
>> offset 0.
>> Why? I am NOT able to guess.
>
>If you don't use fdisk to create a partition on the card, then you
won't
>have one.  If you mkdosfs on /dev/tfa0 then you loose the partition
>table and get a filesystem on just the whole disk.  If you do it with
>/dev/tfa0p1 then you do it on the first partition which would then have
>the FAT filesystem starting at the offset of the first partition (as it
>should).
>
>> For Windows formatted SD there is NO partition table at all.
>> I went on more R&D and tried to get to format the USB-Thumb drive.
>> Even that did NOT have a partition table.
>> It looks like windows treats all removable media device as devices
with
>> NO partitions.
>
>That is right.  Although I believe if windows sees one with a partition
>table it will just use the first valid partition table entry it finds
>and ignore the rest.
>
>> Even on Linux formatted SD there is NO partition table present.
>>
>> Please have a look at the images I am attaching to this mail.
>> I have attached CAM-MS, WIN-Ms & Linux-MS first 512 byte length
Images.
>> These are the Images of first 512 bytes of sector 0.
>> You can find the FS there on Lin & Win Images.
>>
>> I have verified this by keeping some DEBUG messages in the FAT layer
&
>> seeing what data is being passed to this fat_boot_sector structure
when
>> mount call is issued.
>> I am also attaching those LOG messages. please Have a LOOK at them
too &
>> you will have a fair understanding.
>>
>> I have verified it with fdisk -l -u /dev/tfa0
>> It has shown that it is the partition 0 & nothing else.
>>
>> Please see the Images-All-MS-512.tar.gz.
>
>Well to mount anything without a partition table, you would mount the
>whole device (/dev/tfa0) and to mount one with a partition table on it,
>you would mount /dev/tfa0p1 or tfa0p4 or whichever partition it is.
>
>Zip drives used to be the same way.  Some were formated with 1
partition
>(usually 1 or 4) and some had no partition table at all and used the
>whole disk for the filesystem.  I always had a /zip and /zip4 mount
>point I used depending on the particular disk I was looking at.
>
>Len Sorensen

^ permalink raw reply	[flat|nested] 24+ messages in thread
* RE: The Linux FAT issue on SD Cards.. maintainer support please
@ 2005-08-24 13:18 Mukund JB.
  2005-08-24 13:28 ` Lennart Sorensen
  0 siblings, 1 reply; 24+ messages in thread
From: Mukund JB. @ 2005-08-24 13:18 UTC (permalink / raw)
  To: Lennart Sorensen; +Cc: hirofumi, linux-kernel-Mailing-list


Dear Lenneart,

>Most common for disk devices is XXYZ where XX is some name for the
>driver (hd for ide, sd for scsi, other things for other drive types), Y
>is a letter (a for first, b for second, c for third, etc) and Z is the
>partition number.  So in your case you could have:
>
>tfaa for first slot
>tfaa1 for first partition on first slot.
>tfab for second slot
>tfab4 for 4th partition on second slot.
>Or call it tf and use tfa1 tfb4 etc.

That's fine.
My controller itself alone handle FOUR device at a time (u mea these
should be (tfa, b , c d)
But how do I represent if I have more than one such controller i.e. it
is more 4 devices each with more parttions again.

Thanks & Regards,
Mukund Jampala


>
>> I have four sockets on which I have to support individual device with
>> partitions on them. Is there a better conventional way to represent
all
>> the four devices? My driver also supports 4 such controllers. To
support
>> first socket device on the second controller I am using tfb0, tfb0p1,
>> tfb0p2...
>
>Well at least ide and scsi don't care which controller, they still just
>name them in order.  You could just use tfa up to tfp for the devices.
>That is what I would do unless the seperate controllers really make
more
>sense to users (counting to slot 16 might be a bit much using letters
>for some users).
>
>Maybe tf1a2 for controller 1 slot a partition 2 would be nicer to the
>user.  Some raid cards do use /dev/raidname/c1d2p3 for card 1 device 2
>partition 3.  Maybe you prefer that arangement.
>
>> I have left with handling lot of generalization in the code.
>
>Len Sorensen

^ permalink raw reply	[flat|nested] 24+ messages in thread
end of thread, other threads:[~2005-08-24 13:28 UTC | newest]

Thread overview: 24+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-08-11  5:27 The Linux FAT issue on SD Cards.. maintainer support please Mukund JB.
2005-08-11  5:56 ` Marc Singer
2005-08-11 15:33 ` Lennart Sorensen
2005-08-12 14:22 Mukund JB.
2005-08-12 14:48 ` Lennart Sorensen
2005-08-12 14:31 Mukund JB.
2005-08-12 15:46 Mukund JB.
2005-08-12 16:00 ` Lennart Sorensen
2005-08-16 13:24 Mukund JB.
2005-08-16 16:08 ` Lennart Sorensen
2005-08-16 13:34 Mukund JB.
2005-08-16 13:59 ` Olivier Galibert
2005-08-16 16:09 ` Lennart Sorensen
2005-08-17 17:02 Mukund JB`.
2005-08-17 18:50 ` Lennart Sorensen
2005-08-18 12:51 Mukund JB`.
2005-08-18 17:26 ` Lennart Sorensen
2005-08-18 12:56 Mukund JB`.
2005-08-19 11:39 Mukund JB`.
2005-08-19 12:59 ` Lennart Sorensen
2005-08-24  8:33 Mukund JB.
2005-08-24 13:13 ` Lennart Sorensen
2005-08-24 13:18 Mukund JB.
2005-08-24 13:28 ` Lennart Sorensen

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